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Ideal Gas Balloons

Screenshot from 2019-03-05 15-22-26.png

Find the number of balloons that can be filled with the cylinder.
Use P1V1/T1 = P2V2/T2 to find V2 and compare with volume of one balloon?
(You're even given temp in K!)
Reply 2
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esrever
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Original post by old_teach
Use P1V1/T1 = P2V2/T2 to find V2 and compare with volume of one balloon?
(You're even given temp in K!)


I found the total volume of gas in the cylinder at 1.85*10^5 pascals of pressure which was 5.41*10^6 cm^3. Then found (5.41*10^6)/(7.24*10^3) = 747. But the answer is 741.
Sorry - I should have mentioned that 4.0 x 104 cm3 remains in the cylinder, take that from your new volume and you'll fill the correct number of balloons.
Reply 4
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esrever
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Original post by old_teach
Sorry - I should have mentioned that 4.0 x 104 cm3 remains in the cylinder, take that from your new volume and you'll fill the correct number of balloons.


Why does 4.0 x 10^4 cm^3 remain in the cylinder?
Because you can't 'suck' the last bit of gas out of the cylinder, so some remains in there. The question's a bit mean, as I'd forget that in an exam.
Reply 6
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esrever
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Original post by old_teach
Because you can't 'suck' the last bit of gas out of the cylinder, so some remains in there. The question's a bit mean, as I'd forget that in an exam.


Ohh I see! So only the pressure inside the cylinder decreases while the volume remains constant right?

Thank you so much! :smile:

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